Toyota Sienna Service Manual: Short to B+ in Front Pretensioner Squib LH Circuit
DTC B0138/72 Short to B+ in Front Pretensioner Squib LH Circuit
DESCRIPTION
The front pretensioner squib LH circuit consists of the center airbag sensor
assembly and the front seat
outer belt assembly LH.
This circuit instructs the SRS to deploy when deployment conditions are met.
DTC B0138/72 is recorded when a short to B+ is detected in the front
pretensioner squib LH circuit.
DTC No. |
DTC Detecting Condition |
Trouble Area |
B0138/72 |
- Short circuit in front pretensioner squib LH wire
harness (to B+)
- Front pretensioner squib LH malfunction
- Center airbag sensor assembly malfunction
|
- Front seat outer belt assembly LH (Front
pretensioner squib LH)
- Center airbag sensor assembly
- Floor wire
|
INSPECTION PROCEDURE
HINT:
- Perform the simulation method by selecting the "check mode"
(signal check) with the intelligent tester
(8).
- After selecting the "check mode" (signal check), perform the
simulation method by wiggling each
connector of the airbag system or driving the vehicle on a city or rough
road
1 CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PRETENSIONER SQUIB LH)

- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Disconnect the connectors from the front seat outer belt
assembly LH.
- Connect the white wire side of SST (resistance 2.1 Ω) to
the floor wire.
CAUTION:
Never connect a tester to the front seat outer belt
assembly LH (front pretensioner squib LH) for
measurement, as this may lead to a serious injury
due to airbag deployment.
NOTICE:
Do not forcibly insert the SST into the terminals of
the connector when connecting.
Insert the SST straight into the terminals of the
connector.
SST 09843-18060
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Clear the DTCs stored in memory (5).
- Turn the ignition switch to the LOCK position.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Check the DTCs (5).
OK:
DTC B0138/72 is not output.
HINT:
Codes other than DTC B0138/72 may be output at this
time, but they are not related to this check.
Go to step 2

REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH
2 CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT)

- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Disconnect the SST (resistance 2.1 Ω) from the floor
wire.
- Disconnect the connector from the center airbag sensor
assembly.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position.
- Measure the voltage according to the value(s) in the
table below.
Standard voltage

REPAIR OR REPLACE FLOOR WIRE

3 CHECK CENTER AIRBAG SENSOR ASSEMBLY

- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Connect the connectors to the front seat outer belt
assembly LH and the center airbag sensor assembly.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Clear the DTCs stored in memory (5).
- Turn the ignition switch to the LOCK position.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Check the DTCs (5).
OK:
DTC B0138/72 is not output.
HINT:
Codes other than DTC B0138/72 may be output at this
time, but they are not related to this check.
REPLACE CENTER AIRBAG SENSOR
ASSEMBLY

USE SIMULATION METHOD TO CHECK
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DESCRIPTION
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assembly and the front seat
outer belt a ...
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Other materials:
Check mode procedure
1. CHECK MODE (SIGNAL CHECK): DTC CHECK
Connect the intelligent tester to the DLC3.
) Turn the ignition switch to the ON position.
) Select the "SIGNAL CHECK", and proceed
checking using the intelligent tester.
NOTICE:
Select the "SIGNAL CHECK" from the &q ...
System limits
Safety information
Warning
The system is designed to operate in certain
conditions and circumstances. Due to conditions
or other factors, the system may not respond.
There may be a risk of accident or risk
of damage to property. Actively intervene as
warranted. Refer to the information in this Own ...
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